Rendering/OpenGL/Testing was missing dependencies on Rendering/Label
and Rendering/FreeTypeOpenGL.

The following tests require these dependencies:

TestLabelPlacementMapper
TestDynamic2DLabelMapper
TestLabelPlacer
TestLabelPlacer2D
TestLabelPlacerCoincidentPoints
TestLabelPlacementMapper2D
TestLabelPlacementMapperCoincidentPoints

Change-Id: I62fef4753b21550b07b210fa2888a0862e344a16